Capacitor motor



Feb. 25, 1936.

R. P. JAcKso'N Er Ax. 2,032,129

CAPACITOR MOTOR' Filed Nov. 11, 1933 s .sl

INVENTORS. fig, 6 Ray P Jac/P5027 Patented Feb. 25, 1936 UNITED 'STATESPATENT OFFICE CAPACITOR MOTOR sylvanla Y Application November 11,1933,'Serial No. 697,590

6 Claims. (Cl. 172-233)v Our invention relates to electric motors andmore particularly to capacitor motors. Y

An object of our invention is to provide a relatively simple andinexpensive location of, and mounting for, a capacitor in operativeassociation with an electric motor.

Another object of our invention is to provide a relatively simple andeasily mountable and demountable condenser for use in an electric motor.

Other objects of our invention will either be apparent from thedescription of one form of device embodying our invention or will bespecifically pointed out hereinafter. 4;

In practicing our invention we provide an annular condenser which isadapted to be operatively associated with a motor and to be locatedtherein or thereon substantially co-axially with the rotor axis.

In the drawing: Y

Figure 1 is a view partly in elevation and partly in longitudinalsection, through an electric motor with which is associated the deviceparticularly embodying our invention;

Fig. 2 is a view similar to that of Fig. 1 showing a different locationof the condenser;

Fig. 3 is a View. similar to that of Figs. 1 and 2 ,and showing a stillfurther location of the condenser in a motor assembly;

Fig. 4 is another view showing a still further lo- -cation of thecondenser, the location and mounting being otthe kind now preferred byus; l Fig. 5 is a view in end elevation showing particularly themounting of an annular condenser;

Fig. 6 isa view in lateral section through the condenser of Fig. 5; and

Fig. '7 is a diagram showing the electrical connections o f thecondenser. s

Capacitor motors are iinding increased use in the smal/lmotor iield,but, so far as we are aware, the structures heretofore used have beenrather 'cumbersome as well as unbalanced and unsightly. Condensers ofsubstantially rectangular boxV form have been used in many cases andhave been Y mounted either at one end of a motor assembly,

e. g., on one of the bearing brackets, or a rectangular box, enclosingnot only the condenser but also an auto-transformer used therewith, havebeen mounted on top of the motor. Composite 1 structures lof this kindnot only rlookv unsightly but also require a' much larger amount ofspace than l is required by the motor proper, and ii', as may occur insqmeqtypes of motors, there is a tendency to unbalance or vary thetorque, such as oc.l

curs in single-phase alternating-current motors, the assembly is notbalanced relatively'to the axis of the shaft and may result inunbalanced vibratory conditions with an attendant excessive amount ofnoise.

Referring first to Fig. 1, of the drawing, we have there illustrated amotor embodying a stator housing il, bearing brackets I3 and i5associated therewith, and a rotor structure designated in its entiretyby the numeral il. A stator I9 and a stator winding `2| are associatedwith the housing Il in the usual manner, the winding 2i actuallycomprising two windings, a main winding 2in,

and an auxiliary or capacitor winding '2lb (see Fig. 7). While we haveillustrated a speciilc and particular design and assembly, our inventionis not limited to these particular details which are, therefore, shownfor illustrative purposes and are not to be taken in a limiting sense.

An annular condenser 23, which may be of the type shown in detail inFigs. 5 and 6 of the drawing, includes an annular metal casing 25 ofsubstantially channel shape in lateral section and a cover 21 thereonwithin which is located insulating material 29 and the usual condenserstructure 3i including two layers of `conducting material separated by alayer of electric insulating material. It is, of course, within theprovince of our invention to use other forms or types of condenser solong as the condenser is of annular shape. In order to hold thecondenser in proper operative position within the motor assembly, we mayprovide a plurality of peripherally spaced clamping lugs 33, each ofsubstantially Z-shape, for example, one end portion of which may besecured against the housing i l, as is shown in Fig. l of the drawing.

Referring now to Fig. 2 of the drawing, we have there illustrated asubstantially similar motor structure embodying a' housing il, bearingbrackets I3 and I 5, and an annular condenser 31 which may be oi'` thesame type and construction as hereinbefore described, and which ismounted against the outside of bearing brackwithin 'the housing of amotor of this kind, and we have taken advantage of the provision of anannular chamber 45 within the housing 43 and the laminations to locatetherein an annular condenser 41. This condenser may be ofsubstantiallythe same design as described inconnection with Fig. 6 ofthe drawing. understood' that the other parts of the motor assembly areof similar type and design as those described above for Figs. 1 and 2 ofthe drawing. Clamping strips 48 may be provided to assist in holding thehousing parts in proper operative position as well as to hold thecapacitor.

Referring to Figs. 4 and 5 of the drawing, we have there illustrated aform of the invention now preferred by us and including a housing 5l,bearing brackets 53 and 55, as well as a set of stator laminations 51and a stator winding 59, together with a rotor 6l. Y

An annular condenser. 23 is yieldingly held coaxially with the rotor`shaft by means of a plurality, preferably three, leaf springs 65, oneend of which is suitably rigidly secured to a part of theY casing 25 ofthe condenser, while the other or outer end thereof is' rigidlysecuredtothe lugs 61.

We have shown these lugs as provided with housing as in internallyslotted or recessed 1 recesses of the proper radial depth so'that theVmade between the condenser and the particular energizing winding withwhich the condenser is operatively associated and to which it vis elec'-trically connected. Fig. 7 shows adiagram of connections of a capacitormotor using our invention, vthe main Winding being indicated by 21a andthe auxiliary or capacitor winding `by 2lb, the latterv having thecapacitor 23 connected in series circuit therewith.

We may point out that the device embodying our invention provides arelatively simple means for,v mounting a condenser in operativeassociation Awith an electric motor in such a manner that a sightly,symmetrical and balanced assem bly is obtained and in which thecondenser may easily and quicklyv be mounted in its proper operativepositionA and may be easily and quickly disassembled therefrom.

We may point out another effect which we can o btain by the use of aresiliently mounted annular condenser concentric with the axis of therotor and ofthe stator; namely, that the resiliently mounted condenserwill have a damping action upon the stator in case the same is Itistobev-move i tangentially relatively to subjected to torsional or peripheral'oscillations or movements, as occur frequently in motors, in which oneof two phases is not as effective in producing torque as is the otherphase. The annular condenser, when supported by the resilient members65, can oscillate tangentially of the shaft axis through a smalldistance, so that the above described damping action will result.

v Various modifications may be made in the device embodying ourinvention without departing from the spirit and scope thereof, and wedesire, therefore, that only such limitations shall be placed thereon asare imposed by the prior art or are -set forth in the appended claims.

We claimj as our invention:

1. In a capacitor motor including a housing,

a stator structure and a rotor structure therein, an annular condenserstructure within the housing substantially coaxial with the stator androtor, and a plurality of substantially radially-extending leaf springshaving their respective ends operatively engaging the housing and thecondenser structure. Y

2. In a capacitor motor assembly including a housing, a stator and arotor therein, an annular condenser structure within the housing, andspring means operatively connecting the housing and the condenserstructure to hold the latter substantially coaxial with the stator androtor while leaving the condenser structure free to the housing throughshort distances. h

3. In a capacitor motor including a housing structure, a. statorassembly and a. rotor assembly therein, an annular' condenser and-resilient mounting means for the condenser to support it on the housingstructure substantially coaxial with the stator and rotor, saidcondenser being v restrained `with respect to axial movement andsprings, each having one end operatively secured to vthe condenserstructure while the other end extends into a slotted lug to resilientlysupport 'the condenser structure' substantially coaxial with the statorhousing, said condenser structure and springs being movable into properoperative position axially of the stator housing.

6. A device as set forth in claim 5 and including means engaging theslotted lugs to hold the leaf springs in the slotted lugs.

RAY P. JACKSON. HERMAN M. BIEBEL.

